Question from a freind I can't answer

So he had me drive his 93 Ex coupe... no mods really besides the typical Headers, 2.5 catback, and a stage 2 clutch.... So he just recently replaced his Left CV Join and his Ex trany with another 1 cause his crapped out. So I drove it, pulls normal in 1st, u hit 2nd and right around 4,500 RPM about when VTEC kicks in the car climes in speed but the RPM's clime to about 5-6k and stop while the speed increases then they catch up... I also noticed turning hard right the car's power cuts out totaly... I told him sounds like a clutch , a clutch presure plate issue or a Bad CV join on the right side.... any other adivce be nice... Does this right threw every gear minus 1 and 5th cause I can't get it going that fast!

Differental in a FWD car????? We think we pin pointed it tho... he used a Stock Presure plate on a Stage 2 clutch when he reinstalled it, sigh* Least thats what we think it mite be... other thoughs be nice